A dynamical mean-field theory analysis of the attractive Hubbard model in the normal phase is carried out upon restricting to solutions where superconducting order is not allowed. A clear first-order pairing transition as a function of the coupling takes place at all the electron densities out of half filling between a Fermi liquid, stable for U < U-c, and an insulating bound pairs phase for U > Uc, and it is accompanied by phase separation. The spectral function in the metallic phase is constituted by a low-energy structure around the Fermi level, which disappears discontinuously at U = U-c, and two high-energy features (Hubbard bands), which persist in the insulating phase. RI Grilli, Marco/C-6309-2009; Capone, Massimo/A-7762-2008

First-order pairing transition and single-particle spectral function in the attractive Hubbard model

Capone, Massimo;
2002-01-01

Abstract

A dynamical mean-field theory analysis of the attractive Hubbard model in the normal phase is carried out upon restricting to solutions where superconducting order is not allowed. A clear first-order pairing transition as a function of the coupling takes place at all the electron densities out of half filling between a Fermi liquid, stable for U < U-c, and an insulating bound pairs phase for U > Uc, and it is accompanied by phase separation. The spectral function in the metallic phase is constituted by a low-energy structure around the Fermi level, which disappears discontinuously at U = U-c, and two high-energy features (Hubbard bands), which persist in the insulating phase. RI Grilli, Marco/C-6309-2009; Capone, Massimo/A-7762-2008
2002
88
12
Capone, Massimo; Castellani, C; Grilli, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/12296
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